Try and reset your phone, back up your data first. Download Samsung Smart tutor and see if this helps Next if reset and Smart Tutor doesn't work. If the issue is a software glitch, a reflash of your phone could get out of the woods. Need to download Samsung firmware to your pc and unzip it, download and install Samsung USB drivers, and download the latest edition of Odin, put your phone in download mode, load Odin with the files, choose Home file to save your data, connect your phone through USB cable to pc and flash your phone, the firmware is by unlocked and carrier either one will work with unlocked phone, else choose the carrier by CSC code, TMB-Tmobile, TMK-Metro,etc.
